malmstrom



- shade around the roller.

UNITED STATES PATENT @FFICE.

DAVID BLOGH AND PETER E. MALMSTROM, OF NElV YORK, N. Y.

' WINDOW-SHADE FIXTURESAND ROLLER.

SEEGIFICATIQN forming part of Letters Patent No. 294,358, dated March4,-1884.

7 Application filed December 10,1883. (NomodeL) To aZZ whom/it mayconcern.-

Be it known that we, DAVID BLOCH and PETER E. MALMsTRoM, citizens of theUnited States of America, residing at New York, in the county of NewYork and State of New York, have invented certain new and usefulImprovements in Window-Sh ade Fixtures and Rollers; and we do herebydeclare the follow ing to he a full, clear, and exact description of theinvention,such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to that class ofshadefixtures that are providedwith springs, by means of which the shade is automatically wound uponthe roller. The manner heretofore employed to accomplish this was toinsert in one end of aroller especially prepared for the purpose aspiral spring which was wound around a spindle when the shade was pulleddown. lVhen the shade was let up,the spring, unwinding,would, by itsforce, wind the NVhile it is not denied that this mechanism was to acertain extent operative, yet it possessed disadvantages that it is theobject of our invention to overcome. It was necessary with the roller orfixtures heretofore employed to use a stick or roller expressly made forthe purpose, while with the use of our invention we can employ theordinary roller so extensively in use. It is obvious that the cost ofour fixtures is but a small percentage of that of others, while itpossesses the advantage of being fixable in many positions. One othergreat advantage that our invention possesses over others is that it isnot necessary to first wind the spring, since it is only necessary toroll up the shade and set the same, and the spring is wound up bypulling the shade down. ordinary clock-spring, cannot possibly get outof order. In the use of Hartshorns rollers,'if by accident, whiletacking the shade on the stick, a tack is driven the leasttoo deep, theoperation of the spring is stopped and it becomes useless. It isimmaterial in what position the shade may be when removed from thefixture.

In. the accompanying sheet of drawings, Figure 1 represents an insideview of a window with shade-iixture affixed Fig. 2, a view of the casingwith the top removed, showing the mech- The spring,being an A representsthe casing having the angles a,

provided for the purpose of either attaching the fixtureat the end orside. The roller B is provided at its opposite ends with the metal-v liccap-pieces E and K. From E extends the cylindrical stud P, which isloosely journaled -in the bracket -D. The cap-piece K is provided withasimilar prolongation, hollowed out, as shown, to correspond with theflattened sides of the truncated prismoidal end Z of the shaft 0,journaled within the casing A. The shaft 6 is provided with alongitudinal groove for. engagement of the angled pawl f, turning on thesupporting-pin d. A pinion, 0, upon the shaft 0 engages with the teethof a wheel, a, fixed upon the loosely-journaled shaft 12. A band-spring,9, adjacent to the face of the wheel, is attached at its inner end tothe shaft 12, and at its outer end to the fixed pin h. v

The partsbeing arranged and disposed as described, the operation of thedevice is as follows: The curtain being first wound upon the roller 13,the spring gbeing in an uncoiled condition, the curtain may be loweredto any desired height by drawing it down in the ordinary manner. Thelowering of the curtain causes the roller B to revolve in its bearings.The revolution of the roller insures a like movement of the shaft 6, towhich it is clutched by means of the prolongation Z. The pawl f glidesover the surface of the shaft. The fixed pinion 0 upon the shaft 6causes the revolution of the engaging toothed wheel a in an oppositedirection, and the spring 9 accordingly begins towind upon the shaft b.

To arrest the curtain at approximately any desired point it is merelynecessary to hold it at that point for a moment, and then allow itsslight retrograde movement until the pawl f falls into the groove in theshaft 6. To release the curtain from that position and rewind itpartially or completely,-the pawl, by a quick downward movement of thecurtain, is

thrown out of the groove in the shaft c,wl1ereupon the resiliency of thespring g,commnnicated through the wheel a, pinion c, and shaft 0, causesa revolution of the roller B in the contrary direction and rewi-nds thecurtain. Its upward movement may in a similar manner to that beforedescribed be stopped at any desired height. 1

The casing A is made in two sections, east separately, the inner platebeing fitted to the main body, as shown in Fig. 6.

Having described our invention, what we claim is 1. In an automaticspring curtain-roller, the arbor b,provided with the spring 9 andtoothed wheel a, in combination with the shaft 0, longitudinally groovedand formed with the truncated prismoidal end, the pinion 0, carried bysaid shaft and paw], and the roller B, provided with the cap-piece K,for clutching the end of 20 DAVID BLOOH. I I. E. MALMSTROM.

Vitnesses:

hL IRCUS BLooH, Grills. T. BARRY.

